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SCHEDULE II - VALUATION RESERVES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]      
Balance at beginning of year $ 3,404 $ 2,974  
Accounts Receivable, Credit Loss Expense (Reversal) 821 541 $ (362)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction (511) (111) (8)
Balance at end of year $ 3,714 $ 3,404 $ 2,974